Turning on water supply, likely to bottle it, being mature (2,6,7)
I believe the answer is:
no spring chicken
'mature' is the definition.
(I've seen this before)
'turning on water supply likely to bottle it being' is the wordplay.
I cannot really see how this works, but
'on' could be 'o' (I've seen this in other clues) and 'o' is found in the answer.
'water' could be 'spring' (spring water is a kind of water) and 'spring' is found within the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found within the answer.
'being' could be 'chick' (chick is a kind of being) and 'chick' is found within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for no spring chicken that I've seen before include "One who's seasoned" , "Mature" , "unseasoned meat, might you say?" , "Veteran" , "not young any more" .)